Michelangelo revisits his recurring theme of reality/illusion that he started with L'Avventura (1960).
Antonioni spent his entire career asking, where does reality or illusion begin or end. The plot for Blow-Up was inspired by a short story called, "Las babas del diablo" or "The Devil's Drool" (1959) by Julio Cortázar. The translated short story was renamed Blow-Up or Blow-Up and Other Stories. The photographer that David played was inspired by the life of London fashion photographer David Bailey. Herbie Hancockdid the score for the film and called the music Diegetic, and said, "It's only there when someone turns on the radio or puts on a record."

What really struck me as I watched Blow-Up was the scene below where David's character is lost in the "Process" of his photographic art. As an actor I get, so lost in my artistic Process that I forget to eat, sleep, drink, sex, etc... There is no sound, dialogue or music in the clip below yet Michelangelo guides us through David photographic Process to gradually see what he begins to see in the series of photos he took. Its like being in a detectives investigative process as he gradually uncovers the story hidden within the photos.

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